The AllergyZone Model FQT 12 Furnace Filter has a Filter Quality Triangle rating of 12, indicating superior performance in three crucial areas necessary for healthy air quality: Efficiency, Air Flow, and Holding Capacity. AllergyZone filters are designed to remove small particles that trigger allergy and asthma symptoms while providing excellent air flow and dirt holding throughout the life of the filter. Developed by an allergy and asthma physician, the AllergyZone filter provides high efficiency and excellent overall performance. Your furnace and the AllergyZone filter work together to clean the air passing through your heating and air conditioning system. 1-inch thick filters are available in six (6) sizes. Sold in packs of 4 filters. Replace quarterly for best performance.
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